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HTPC Itunes stuttering
Hi,
Hopefully someone can help me solve an issue I am having with my HTPC. I have exhausted Apple support (well their support may as well have been "have you tried turning it off and on again ).
When I play iTunes purchased content (TV Season passes) on my HTPC at 1080p @ 60hz, the video stutters like mad. If I play the same content via Quicktime, there is no stuttering. If I drop the resolution down to 1080p @ 24hz (using the ATI software), video no longer stutters in iTunes, but I get flickers on the screen when changing windows or when a page loads.
If I play HD content using my BD drive or XBMC, I get absolutely no stuttering and it plays flawlessly at 1080p @ 60hz.
I've even tried different brands of TV, as there were issues with the Apple TV on Samsung TV's. I borrowed an LG LCD and the same as the above mentioned (stutter at 1080p @ 60hz, no stutter @ 24hz).
My HTPC specs are:
Intel Core i3 2120
Asus P8H67-M PRO Rev.3.0
Seasonic X-400FL 460W ATX Fanless PSU
Corsair XMS3 Desktop Memory 8GB (2 x 4GB)
Crucial M4 64gb
Samsung F4 2TB HDD
Sapphire HD6670 1GB Ultimate Graphics Card
Does anyone have any ideas on how to rectify this?
Thanks in advance.
Regards,
Ross